| abstract |
Compounds of formula (I) and salts thereof, wherein: R1 represents methyl, ethyl, isopropyl or s-butyl; R2 represents hydrogen or alkyl; R3 represents hydrogen, optionally substituted alkanoyl, optionally substituted alkenoyl, optionally substituted alkynoyl, alkylsulfonyl, or alkoxycarbonyl, or R?2 and R3¿ together with the nitrogen atom to which they are attached form a saturated, optionally substituted 4- to 6-membered heterocyclic ring group; andthe moiety -a- together with the carbon atom to which it is attached forms a 3- to 6-membered cycloalkyl group. These compounds have anthelmintic, acaricidal and insecticidal activity. |